Organization and Basis of Presentation (Details) $ in Thousands					1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 22, 2016 location	Jun. 29, 2016 USD ($) location	Jun. 11, 2015 shares	Jan. 07, 2015 store	Jun. 30, 2015 shares	Dec. 31, 2014 shares	Sep. 30, 2016 shares	Sep. 30, 2015	Sep. 30, 2016 USD ($) item shares	Sep. 30, 2015 USD ($)	Dec. 31, 2015 shares	Feb. 01, 2013
Organization
Number of owned, leased and/or supplied gasoline stations | item									1,472
Number of convenience stores | item									257
General partner interest (as a percent)							0.67%	0.67%	0.67%
Number of common units held							33,533,402		33,533,402		33,506,844
Cash price | $									$ 58,917	$ 2,548
Partners' Capital Account, Units, Sold in Public Offering			3,000,000		3,000,000
General Partner
Organization
General partner interest (as a percent)									0.67%
Affiliates of general partner
Organization
General partner interest (as a percent)									21.90%
Number of common units held							7,433,829		7,433,829
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations [Member] | Sale Leaseback Sites [Member]
Organization
Number of sites under financing obligation | location		30
Sale leaseback, gross proceeds | $		$ 63,500
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Mirabito Disposition [Member] | NY and PA
Organization
Number of locations divested | location	30
Warren Equities Inc
Organization
Number of convenience stores | store				147
Percentage of outstanding membership interests acquired				100.00%
Partners' Capital Account, Units, Sold in Public Offering						3,565,000
Basin Transload LLC
Organization
Percentage of outstanding membership interests acquired												60.00%